Cumulative GPA Calculator. Well formatted and easy to use. Based on five year study plan with their summer semesters which means 15 semesters (no need to use all of them). It works for all GPA systems (for example out of 4, 4. 33, 5) and for all grades (with/without minus and plus grades) and that by entering the letter grades and their corresponding GPA values according to the system your university uses once and for all. It calculates No. of points, Semester GPA, Cumulative GPA and Attempted Hours after each semester.